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EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to Common Shareholders | $ 3,789 | $ 3,843 | $ 4,245 | $ 8,185 | $ 6,589 | $ 4,592 | $ 12,250 | $ 4,829 | $ 20,062 | $ 28,260 | $ 26,574
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Preferred OP Unit distributions |  |  |  |  |  |  |  |  | 18 | 18 | 19
Employee share options |  |  |  |  |  |  |  |  | 264,000 | 245,000 | 212,000
Convertible Preferred OP Units |  |  |  |  |  |  |  |  | 25,000 | 25,000 | 25,000
Dilutive potential Common Shares |  |  |  |  |  |  |  |  | 289,000 | 270,000 | 237,000
Numerator for diluted earnings per Common Share |  |  |  |  |  |  |  |  | 20,080 | 28,278 | 26,593
Denominator |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic earnings per share |  |  |  |  |  |  |  |  | 40,697,000 | 40,136,000 | 38,005,000
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Preferred OP Unit distributions |  |  |  |  |  |  |  |  | $ 18 | $ 18 | $ 19
Employee share options |  |  |  |  |  |  |  |  | 264,000 | 245,000 | 212,000
Convertible Preferred OP Units |  |  |  |  |  |  |  |  | 25,000 | 25,000 | 25,000
Dilutive potential Common Shares |  |  |  |  |  |  |  |  | 289,000 | 270,000 | 237,000
Denominatior for diluted earnings per share | 42,066,390 | 40,628,781 | 40,633,317 | 40,580,173 | 40,594,009 | 40,430,998 | 40,371,812 | 40,149,931 | 40,986,000 | 40,406,000 | 38,242,000
Basic earnings per Common Share from continuing operations attributable to Common shareholders | $ 0.09 | $ 0.10 | $ 0.11 | $ 0.20 | $ 0.16 | $ 0.12 | $ 0.30 | $ 0.12 | $ 0.50 | $ 0.70 | $ 0.70
Diluted earnings per Common Share from continuing operations attributable to Common Shareholders | $ 0.09 | $ 0.10 | $ 0.10 | $ 0.20 | $ 0.16 | $ 0.12 | $ 0.30 | $ 0.12 | $ 0.49 | $ 0.70 | $ 0.70
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 25,067 | 25,067 | 25,067
Acadia Realty, LP [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares through special dividend (in shares) |  |  |  |  |  |  |  |  |  |  | 1,287,000

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